EP 0584545 A1 19940302 - Lighting device.
Title (en)
Lighting device.
Title (de)
Beleuchtungseinrichtung.
Title (fr)
Dispositif d'éclairage.
Publication
Application
Priority
IT TO920637 A 19920724
Abstract (en)
The device comprises a block of transparent material (1) delimited by a pair of opposite surfaces, a front surface (2) and a rear surface (3) and a source of light radiation (4) located between said surfaces: cavities (5) are formed in the rear surface (3), each of which cavities is delimited at least by one surface (6) which forms a predetermined angle with the rear surface (3) and diffraction means (7) are located on the front surface (2), on which means the light rays reflected by the rear surface (3) are incident and by which means these rays are diffracted so as to give a light flux having predetermined optical characteristics. <IMAGE>
IPC 1-7
IPC 8 full level
F21S 8/10 (2006.01); F21V 5/00 (2006.01); F21V 8/00 (2006.01); G02B 6/00 (2006.01)
CPC (source: EP US)
F21S 43/239 (2018.01 - EP); F21S 43/245 (2018.01 - EP); F21S 43/247 (2018.01 - EP); F21V 5/002 (2013.01 - EP US); G02B 6/0038 (2013.01 - EP US); G02B 6/0046 (2013.01 - EP); G02B 6/0021 (2013.01 - EP); G02B 6/0051 (2013.01 - EP); G02B 6/0071 (2013.01 - EP); G03H 1/2202 (2013.01 - EP)
Citation (search report)
- [YA] WO 9007766 A1 19900712 - HUGHES AIRCRAFT CO [US]
- [YA] "high efficiency backlight for lcd", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 33, no. 9, February 1991 (1991-02-01), ARMONK,NY. US, pages 261 - 262
- [A] PATENT ABSTRACTS OF JAPAN vol. 14, no. 436 (M - 1027) 18 September 1990 (1990-09-18)
- [A] PATENT ABSTRACTS OF JAPAN vol. 16, no. 489 (P - 1433) 9 October 1992 (1992-10-09)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0584545 A1 19940302; EP 0584545 B1 19961009; DE 69305292 D1 19961114; DE 69305292 T2 19970327; IT 1256894 B 19951227; IT TO920637 A0 19920724; IT TO920637 A1 19940124
DOCDB simple family (application)
EP 93111866 A 19930723; DE 69305292 T 19930723; IT TO920637 A 19920724